WP1 Teleconference June 14 2005 Luca Taffarello

The status report of the AURIGA detector

Luca Taffarello

(INFN Sezione di Padova )

Special tanks to L. Conti and G. Vedovato

WP1 Teleconference June 14 2005 Luca Taffarello

Summary of the talk: New detector set-up First Results, calibration and thermal behaviour BUT

evidence of noise peaks External excitation to identify the input ports to avoid

the noise (mechanical excitation @ low frequencies) Strategy to overcome the disturbances

Definition of epoch vetoes in A.D. througt thresold identification New dampers and pneumatic isolation system @ low frequencies

Result achieve1. Good data in nigth and week end (2° Dec 2004-18° May

2005)2. Very stable and gaussian behaviour (from 19 May 2005)

WP1 Teleconference June 14 2005 Luca Taffarello

new mechanical suspensions: attenuation > 360 dB at 1 kHz FEM modelled

new capacitive transducer: two-modes (1 mechanical+1 electrical) optimized mass

new amplifier: double stage SQUID 200 energy resolution

new data analysis: C++ object oriented code frame data format

Expected target AURIGA II run with 1999-2003 upgrades

WP1 Teleconference June 14 2005 Luca Taffarello

Evidence of spurious peaks in the bandwidth

Setting @ T = 4.5K = experimental. data = simulation

immediatly is started a diagnostic phase to addressthe spurious features in the noise spectra

Best quiet period December 2003

WP1 Teleconference June 14 2005 Luca Taffarello

The thermal behaviour of the modes is estimates by the measurement of the real part of the input impedence to the SQUID a 4.5 K

Not evident lost of charge

T= 4.5 KE bias=7.5 MV/m

‚ ƒ 61.15 10scaricoQ =865.68 Hz

61.15 10caricoQ

‚ =914.14 Hz65 10scaricoQ

60.74 10caricoQ ƒ =955.63 Hz

60.75 10caricoQ

60.45 10scaricoQ

1000 400cold dampedQ

This is thermal

First step: Calibration of the 3 sensitives modes

WP1 Teleconference June 14 2005 Luca Taffarello

2 Step: THE MECHANICAL TRANSFER FUNCTION

VERY IMPORTANT not evident excitation with mechanical and-or electromagnetic actuators

‚

ƒ

mechanical mode near the switch

Electrome-chanical modes

Mechanical modes of the charge plates

WP1 Teleconference June 14 2005 Luca Taffarello

800 850 900 950 10001x10-22

1x10-21

1x10-20

1x10-19

AURIGA T=4.5K

Sh

h

0.5 [

Hz-1

/2]

Frequency [Hz]

- noise prediction- mechanical thermal - LC thermal- SQUID back action - SQUID additive

Complete control of the internal sources of noise(Note: one-sided spectra !)

December 2004after the firstup-grading detector up therubber

WP1 Teleconference June 14 2005 Luca Taffarello

Strategy to cope the spurious peaks Identification of noise sources: noise hunting Definition of the possible hardware solutions: 2 steps

1. Rubber dissipation layer below the cryostat(roll-off frequency 8-10 Hz Q=2)

2. Active-air mount (Vibraplane KS) automatic leveling/heigth control low vertical natural frequency and orizontal isolation 1-

2 Hz internal damping Q=2 and broad load range)

Very important parameter the Q factor to avoid other nolinear-coupling where the seismic power is higher and the movement of the cryostat can generate dangerous mechanical stress in the detector

Decision to maintain on air the detector because from the analysis data is possible to understand more what is wrong and to control directly the efficiency of the new set-up

Definition of epoch vetoes to obtain time period of data workable

WP1 Teleconference June 14 2005 Luca Taffarello

Noise hunting: 3 step analysis

1. Definition of peaks or band noise sources2. Identification of noise sensitive peaks out

bandwidth3. Application of epoch vetoes based by

crossing thresholds previous defined applied to this out bandwidth peaks

WP1 Teleconference June 14 2005 Luca Taffarello

Analysis of auxiliary channelsSpurious peak in bandwidth894 Hz

SQUID output18-22 Hz

Sismometer 8-22 Hz

Acc. Inside vacuum chamber8-22 Hz

4daysfriday-monday

WP1 Teleconference June 14 2005 Luca Taffarello

Evidence of connection between external (seismic) activities and bandwidth

1

DAY

OUTPUT ofSISMOMETERin the cryostat0-22 Hz

sensitive bandwidth

Not Possibleto determine a correlation between the external disturbances and the response in the sensitive bandwidth

Evidence for not-linearity behaviour

WP1 Teleconference June 14 2005 Luca Taffarello

Low frequency mechanical excitation and response in the detector bandwidth

2 example also without electrical field

Shaking frequency 18.62 HzEffect: all the multiple

Shaking frequency 16.57 HzEffect: some cluster with more peaks equidistant 16.57/3 Hz

Not possible to reach shaking frequencybelow 10 Hz the seismic noise is too power

WP1 Teleconference June 14 2005 Luca Taffarello

Sunday - Clean Spectrum

950 Hz

900 Hz

Sp

Sp

Sp

Sp S

p

Sp= spurious One year of data between dec. 03 to dec 04

WP1 Teleconference June 14 2005 Luca Taffarello

Clean/Noisy Spectrum

“Normal” Noisy spectrum

WP1 Teleconference June 14 2005 Luca Taffarello

Run 590 (Time-Frequency) from Sat 11h-13/11/04 to Mon 12h-15/11/04

Clean Raw Data

Noisy Raw Data

Sat

Sun

Mon

Only during the Sunday nigth is possible see the better spectraduty cycle Gaussian and stationary very poor 20 %, evidence of Monday morning effect, Human Activities?

WP1 Teleconference June 14 2005 Luca Taffarello

Run 590 (Time-Frequency)5 hours

F5

F5

F5

F5

F1

F1

F1

F1

It is possible to define some group of spurious peaks correlatedF means Family, during the history different family appear and dissapear

WP1 Teleconference June 14 2005 Luca Taffarello

Run 608 - Vetoes

F5 Veto (120 s)236.95 +/- 0.2

Hz

Wide Band Veto

Wide BandSpurious

F5

F1 Veto (60 s)241.25 +/- 0.5

HzF7 Veto (60 s)1133.2 +/- 2 Hz

F1

F7

More clean data, long period good in the nigths and in week-end

4000 s Time-frequency behaviour during normal day

WP1 Teleconference June 14 2005 Luca Taffarello

F5 Veto 236.95+/- 0.2 Hz F5 893.63 Hz

F5 Veto

WP1 Teleconference June 14 2005 Luca Taffarello

F5Threshold

veto

F5Ada lck psp plugin @ 236.95+/- 0.2 Hz

F5Veto

ampl

itude

WP1 Teleconference June 14 2005 Luca Taffarello

Previous position

Position control feed-backlift used with the liquid heliuminside the dewars

First hardware up-grade: rubber layer of Sylodamp (Angst Pfister)

Starting new run 2 Dec. 2004

WP1 Teleconference June 14 2005 Luca Taffarello

AURIGA Events [no vetoes]

SN

R

Italian Holiday

WP1 Teleconference June 14 2005 Luca Taffarello

AURIGA Events [with vetoes]

SN

R

Is possible to apply the epoch vetoes and the result is a duty cycle 60 %

WP1 Teleconference June 14 2005 Luca Taffarello

AURIGA Events [with vetoes & prob>0.00001]

SN

R

a test of consistency about the shape of the burst

WP1 Teleconference June 14 2005 Luca Taffarello

AURIGA Events [with vetoes & prob>0.00001]

Am

plitu

de

Good stability of the detector in absolute amplitude

WP1 Teleconference June 14 2005 Luca Taffarello

SNR Distribution (with vetoes) (Simulation/Red)

SNR

3 eventswith SNR >10during9 days

WP1 Teleconference June 14 2005 Luca Taffarello

Last hardware up-grade:external suspensions low frequency and with vibrational damping

Air springs: effective above1-2 Hz

WP1 Teleconference June 14 2005 Luca Taffarello

Metal-arc welding with liquid helium inside the dewarswithout bias in the trasducer

A kind of “wings” to support Auriga above the center of mass of the cryostat

WP1 Teleconference June 14 2005 Luca Taffarello

Low frequency suspensions installed (May 19th)

Final configuration Ferroconcrete Pillar

WP1 Teleconference June 14 2005 Luca Taffarello

Low frequency suspensions installed (May 19th)

suspension activation

WP1 Teleconference June 14 2005 Luca Taffarello

Before the up-grade

AFTER! Also during the day

WP1 Teleconference June 14 2005 Luca Taffarello

Low frequency suspensions installed (May 19th)before after

Not so evident and dramatic the isolation effect, but impressive the effect in the data!

in the best case 1 order of magnitude in amplitude

WP1 Teleconference June 14 2005 Luca Taffarello

Perfect Gaussian and stationarybehaviour, duty cycle > 98%